Hi traxman,
jmccarty's tutorial should work fine even if you're using the I2C slave port instead of the SPI slave port. Simply change the drop-down menu on the USBi (the one connecting to the ADAU1452) to I2C and select the proper address.
The EEPROM self-boot operation occurs on the master control port, while the computer communicates via the USBi to the ADAU1452 using the slave control port. The master control port and slave control port do not require the same communications protocol; each of these can independently be configured to operate in either I2C or SPI mode.